CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation
Description
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in pkey_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer.
INFO
Published Date :
July 29, 2026, 5:16 p.m.
Last Modified :
July 29, 2026, 5:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64558
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the latest version.
- Ensure the pkey_pckmo handler checks target buffer length.
- Verify patch implementation for pkey_pckmo.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64558.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64558 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64558
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64558 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64558 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 29, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '8fcc231ce3bea12b78bb94b280cdc03cff342435', 'lessThan': '02028a24e26d85262ab9c8fc4344e1f3503007fc', 'versionType': 'git'}, {'status': 'affected', 'version': '8fcc231ce3bea12b78bb94b280cdc03cff342435', 'lessThan': '433e5e70cdc1edf382d28d08a885b22e2b98b7da', 'versionType': 'git'}, {'status': 'affected', 'version': '8fcc231ce3bea12b78bb94b280cdc03cff342435', 'lessThan': '614aa0491c7a190556c2345dddee0b6f5ed90989', 'versionType': 'git'}, {'status': 'affected', 'version': '8fcc231ce3bea12b78bb94b280cdc03cff342435', 'lessThan': '1ac287e2af9a9112fe271427ef45eceb26bce8b4', 'versionType': 'git'}], 'programFiles': ['drivers/s390/crypto/pkey_pckmo.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.12'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/s390/crypto/pkey_pckmo.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in pkey_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer. Added Reference https://git.kernel.org/stable/c/02028a24e26d85262ab9c8fc4344e1f3503007fc Added Reference https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4 Added Reference https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da Added Reference https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989